CN107164716B - Powder core wire and method for preparing high-speed electric arc spraying coating - Google Patents
Powder core wire and method for preparing high-speed electric arc spraying coating Download PDFInfo
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- CN107164716B CN107164716B CN201710442216.7A CN201710442216A CN107164716B CN 107164716 B CN107164716 B CN 107164716B CN 201710442216 A CN201710442216 A CN 201710442216A CN 107164716 B CN107164716 B CN 107164716B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/131—Wire arc spraying
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
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Abstract
The invention discloses a powder core wire and a method for preparing a high-speed electric arc spraying coating, belonging to the technical field of anticorrosive materials. The powder core wire consists of an aluminum alloy sheath and a powder core formed by alloy powder, wherein the alloy powder comprises SiC powder, WC powder and Ti powder; according to the mass ratio, the alloy powder comprises the following components in percentage by mass: SiC: 8% -46%, WC: 14% -46%, Ti: 8 to 46 percent. When the powder core wire is used for preparing the high-speed electric arc spraying coating, firstly, the surface of a matrix is subjected to sand blasting pretreatment, and then an Al-SiC-WC-Ti coating, namely the Al-SiC-WC-Ti high-speed electric arc spraying coating, is prepared on the surface of the pretreated matrix by using a high-speed electric arc spraying process method. The prepared Al-SiC-WC-Ti coating has the characteristics of high bonding strength, excellent corrosion resistance, high surface hardness and the like, and can be stably used in a high-pressure corrosion and erosion environment.
Description
Technical Field
The invention relates to the technical field of anticorrosive materials, in particular to a powder core wire and a method for preparing a high-speed electric arc spraying coating.
Background
Oil field storage and transportation facilities (such as oil field sewage tanks, three-phase separators, process pipelines and the like) often face harsh environmental conditions of high-pressure corrosion and erosion, and long-acting protection is difficult to realize by only relying on organic coatings. The use of metal coatings is one of the effective methods to solve the corrosion/wear problem. The high-speed electric arc spraying technology is a technology which melts alloy wires or powder core wires prepared from two metals or alloys by utilizing electric arcs between the two wires, atomizes the wires into micro molten drops by utilizing compressed air, and sprays the micro molten drops onto the surface of a workpiece at a high speed to form a coating. The high-speed electric arc spraying technology is the most commonly used thermal spraying technology in practical application projects such as steel structure corrosion prevention, wear resistance, mechanical part maintenance and the like, and has the advantages of high production efficiency, low cost, high process realization flexibility, small heat transmission to a workpiece matrix and the like.
The pure Al coating has negative potential and is suitable for coating on carbon steel or alloy steel. Compared with carbon steel or alloy steel, the pure Al coating is equivalent to an anode, and in the service process, Al can be preferentially corroded to protect a steel matrix on one hand, and on the other hand, corrosion products generated by the Al can effectively block micropores on the surface of the coating to form a self-sealing effect, so that the effect of protecting the steel matrix is achieved. Al coatings have mature applications as heavy duty corrosion protection means in many areas, for example: on the gate of the three gorges dam, the anticorrosion process of 'electric arc spraying Al coating (200 mu m) + sealant' is adopted for treatment. In addition, the Al-based coating is widely applied to a plurality of marine steel piles and bridge structures.
The pure Al coating has good corrosion resistance, but because the aluminum has soft texture and low hardness, the Al coating is often consumed rapidly under the environment of mechanical damage such as erosion, abrasion and the like. Solid particles such as soil, sand and stone are often accompanied in an oil field medium, meanwhile, an oil field storage and transportation facility also faces the problem of medium damage caused by high-pressure corrosion, and under the harsh environmental conditions of high-pressure corrosion and abrasion, an Al coating can be quickly lost, so that the service life of the oil field storage and transportation facility is reduced, and long-term protection is difficult to realize.
Disclosure of Invention
The invention provides a powder core wire and a preparation method of a high-speed electric arc spraying coating, and solves the technical problem of high loss of a pure Al coating in a high-pressure corrosion and erosion environment.
In one aspect, the present invention provides a powder core wire comprising an aluminum alloy sheath and a powder core formed of alloy powder containing SiC, WC and Ti; according to the mass ratio, the alloy powder comprises the following components in percentage by mass: SiC: 8% -46%, WC: 14% -46%, Ti: 8 to 46 percent.
Preferably, the particle sizes of the SiC, the WC and the Ti are 178-297 mu m.
Preferably, the powder core filling rate of the powder core wire is 33-37%.
Furthermore, the alloy powder also comprises Al powder, and the powder core filling rate is 33-37%.
In another aspect, the present invention provides a method of producing a high-speed arc sprayed coating using the above cored wire, comprising:
carrying out sand blasting pretreatment on the surface of the matrix;
and (3) carrying out high-speed electric arc spraying on the surface of the pretreated matrix to form an Al-SiC-WC-Ti coating, namely the Al-SiC-WC-Ti high-speed electric arc spraying coating.
Preferably, the substrate is made of carbon steel or alloy steel.
Preferably, when the sand blasting pretreatment is carried out, the pressure is controlled to be 0.6-0.8MPa, the sand blasting angle is 70-90 degrees, and the sand blasting distance is 150-180 mm.
Preferably, the process parameters of the high-speed arc spraying are as follows: the compressed air pressure is 0.6-0.8MPa, the spraying voltage is 32-36V, the spraying current is 110-140A, and the spraying distance is 150-180 mm.
Preferably, the thickness of the Al-SiC-WC-Ti coating is 200-500 mu m.
In another aspect, the invention provides an oil field storage and transportation facility, which comprises a substrate and a coating sprayed on the surface of the substrate, wherein the coating is prepared by high-speed electric arc spraying of the powder core wire.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
(1) according to the powder core wire provided by the embodiment of the invention, the hard phase particles are added into the powder core wire to enhance the hardness of the Al coating, and the high-pressure corrosion resistant element is added to enhance the high-pressure corrosion resistance of the Al coating, so that the technical problem that the pure Al coating is quickly lost in a high-pressure corrosion and erosion environment is effectively solved;
(2) the high-speed electric arc spraying layer prepared by the embodiment of the invention has the characteristics of high bonding strength, excellent corrosion resistance, high surface hardness and the like; the prepared composite coating can be applied to an anti-corrosion coating of an oil field storage and transportation facility, can be stably used in a high-pressure corrosion and erosion environment, and can prolong the service life of the oil field storage and transportation steel structure facility.
Drawings
FIG. 1 is a flow chart of a method of preparing a high speed electric arc sprayed coating in an embodiment of the present invention;
FIG. 2 is a surface photomicrograph of the Al-SiC-WC-Ti arc sprayed coating prepared in example 1 of the invention;
FIG. 3 is a photograph showing the microstructure of the cross section of the Al-SiC-WC-Ti arc-sprayed layer prepared in example 1 of the present invention.
Detailed Description
The embodiment of the invention provides a powder core wire and a method for preparing a high-speed electric arc spraying coating, solves the technical problem of high loss of a pure Al coating in a high-pressure corrosion and erosion environment, can be applied to an anti-corrosion coating of an oil field storage and transportation facility, and prolongs the service life of the oil field storage and transportation steel structure facility.
In order to solve the above technical problems, the general idea of the embodiment of the present invention is as follows:
the invention provides a powder core wire, which consists of an aluminum alloy sheath and a powder core formed by alloy powder, wherein the alloy powder contains SiC, WC and Ti; according to the mass ratio, the alloy powder comprises the following components in percentage by mass: SiC: 8% -46%, WC: 14% -46%, Ti: 8 to 46 percent.
From the above contents, the aluminum alloy is adopted as the sheath of the wire, the Al is adopted as the corrosion-resistant phase matrix, and the SiC and WC hard particle phases are added into the Al matrix to form a corrosion-resistant and wear-resistant coating structure of a soft matrix and hard points, so that the effects of increasing the hardness and wear resistance of the coating are achieved; meanwhile, Ti element is added, so that the high-pressure corrosion resistance of the coating can be effectively improved; therefore, the technical problem that the pure Al coating is quickly worn under the environment of high-pressure corrosion and erosion is effectively solved, and the preparation method can be used for preparing the anticorrosive coating of the oil field storage and transportation facility and can prolong the service life of the oil field storage and transportation steel structure facility.
In order to better understand the technical solutions of the present invention, the technical solutions of the present invention are described in detail below with reference to the drawings and the specific embodiments, and it should be understood that the specific features in the embodiments and the embodiments of the present invention are detailed descriptions of the technical solutions of the present invention, and are not limitations of the technical solutions of the present invention, and the technical features in the embodiments and the embodiments of the present invention may be combined with each other without conflict.
In one aspect, embodiments of the present invention provide a powder core wire, consisting of an aluminum alloy sheath and a powder core formed of alloy powder, the alloy powder comprising SiC, WC, and Ti; according to the mass ratio, the alloy powder comprises the following components in percentage by mass: SiC: 8% -46%, WC: 14% -46%, Ti: 8 to 46 percent.
In the embodiment of the invention, the particle sizes of SiC, WC and Ti are 178-297 mu m, the flame flow in the spraying process is unstable due to too large or too small particle sizes of SiC, WC and Ti, and the particles are sieved by a 50-80-mesh sieve in the specific implementation process so as to ensure proper particle sizes. SiC powder, WC powder and Ti powder are used as main fillers, the SiC powder, the WC powder and the Ti powder are required to be fully mixed, and the particle sizes of the three must not be too different, so that segregation is avoided in the powder mixing process.
In the embodiment of the invention, the powder core filling rate of the powder core wire material is 33-37%. Too high filling rate can cause difficult wire drawing in the preparation process of the powder core wire, and too low filling rate can easily cause hollow core of the wire.
Furthermore, the alloy powder also comprises Al powder, and the powder core filling rate is 33-37%. In order to ensure reasonable filling rate and full reaction of the alloy powder and the aluminum alloy sheath, Al powder with the same granularity can be properly added into the alloy powder for balancing.
According to the embodiment of the invention, the hardness of the hard phase enhanced coating such as SiC and WC is utilized, the Ti element is added to improve the high-pressure corrosion resistance of the Al coating, and the factors such as the melting point and the granularity of each powder are fully considered, so that the powder core wire capable of being stably sprayed is obtained. By adopting the design of the cored wire, the utilization rate of materials can be improved to the maximum extent, and the cored wire is less influenced by different melting points of different materials, so that the cored wire is convenient to prepare.
The aluminum alloy sheath and the powder core in the powder core wire provided by the embodiment of the invention have the following functions:
al tape: aluminum alloy is used as the sheath of the wire, as a metal having a lower potential than the Fe electrode, and can play a role in cathodic protection of the sacrificial anode on the base steel during corrosion, so that Al is used as the main phase.
SiC powder: the SiC has higher hardness, can be used as a wear-resistant particle in the Al-based coating, is relatively stable at high temperature, can still keep the original shape even after being sprayed at high temperature, and is a powder material which is very suitable for spraying. SiC belongs to ceramic powder, and can not be fully melted in the spraying process to form splash when too much SiC is added, and can not achieve the purpose of increasing the hardness of the coating when too little SiC is added, so that the content of SiC in the alloy powder is comprehensively determined to be 8-46%.
WC powder: WC also has higher hardness, and simultaneously WC also has stronger shock resistance. Proper amount of WC is added into the powder core, so that the impact resistance and the erosion resistance of the coating can be effectively improved, and the stability of wear-resistant particles can be effectively improved. WC belongs to ceramic powder, but because the molecular weight of the WC is larger, the addition of other alloy components is influenced by excessive addition, and the effect of stabilizing the coating structure cannot be achieved by insufficient addition, the content of the WC in the alloy powder is comprehensively determined to be 14% -46%.
Ti powder: ti is more active at high temperature and can be combined with elements such as N, O and the like in the spraying process, so that the loss of Al is reduced, and the activity of the Al coating is maintained. TiN, TiO formed during spray coating2The compounds such as AlTi and the like have good corrosion resistance and thermal stability, and simultaneously can play a role in coatingGood framework supporting function. However, since too large an amount of Ti added tends to cause intergranular corrosion and too small an amount of Ti added does not provide an effect of enhancing the corrosion resistance, the total content of Ti in the alloy powder is determined to be 8% to 46%.
The powder core wire in the embodiment of the invention is prepared by adopting the conventional method:
firstly, uniformly mixing SiC powder, WC powder and Ti powder according to a designed proportion, preparing an aluminum alloy strip with a certain specification, wherein the strip is required to have a certain thickness to keep the drawing strength of the strip, preparing a finished wire through processes of strip cutting, strip rolling, powder filling, sealing, wire drawing and the like by a powder core wire forming device, and the technological parameters in the wire production process are required to be capable of continuously producing and avoiding the phenomena of strip turning, strip breaking, wire breaking and the like.
On the other hand, based on the same inventive concept, embodiments of the present invention provide a method of preparing a high-speed arc sprayed coating using the above-described cored wire, referring to FIG. 1, including:
step S110: carrying out sand blasting pretreatment on the surface of the matrix;
the substrate is made of carbon steel or alloy steel. The surface of the substrate before spraying must be grit blasted to clean and roughen.
During sand blasting, compressed air must be cleaned and dried, the pressure is controlled to be 0.6-0.8MPa, corundum sand or other abrasives meeting relevant regulations are adopted, the sand blasting angle is 70-90 degrees, the sand blasting distance is 150-180mm, the sand blasting requires that the base body is completely exposed out of a fresh surface, but the sand blasting time is not long. The surface roughness of the substrate after sand blasting is about Sa2.5 level.
Step S120: and (3) carrying out high-speed electric arc spraying on the surface of the pretreated matrix to form an Al-SiC-WC-Ti coating, namely the Al-SiC-WC-Ti high-speed electric arc spraying coating.
The high-speed electric arc spraying is carried out by utilizing the existing high-speed electric arc spraying equipment, and the technological parameters of the high-speed electric arc spraying are as follows: the compressed air pressure is 0.6-0.8MPa, the spraying voltage is 32-36V, the spraying current is 110-140A, and the spraying distance is 150-180 mm. The flame flow is not concentrated and the splashing phenomenon occurs due to the overlarge pressure of the compressed air; too small a flame flow cannot achieve the desired spray velocity. The excessive evaporation of the wire can be caused by the excessive spraying voltage, and the wire is not reached to the substrate and is greatly lost; too small a wire does not strike an arc. The excessive spraying current can cause the wire material to be over-burnt, and the spraying stability is influenced; too small a wire may not melt sufficiently, affecting the coating properties. Too large spraying distance can cause the molten drops of the wire to be insufficiently combined with the matrix steel, and the formed coating has lower bonding strength; too small of a size causes the droplets to splash, affecting the coating deposition rate. The technological parameters are finally determined by comprehensively considering the interaction and the mutual influence among all the technological factors, the technological parameters can ensure that the flame flow is the most stable, the coating has better compactness, and the sprayed coating can have high bonding strength and low porosity.
The thickness of the formed Al-SiC-WC-Ti coating is 200-500 mu m. The sprayed coating has proper thickness, the coating is too thin to have good corrosion and wear resistance effects, and the coating is too thick to cause stress concentration and reduce the bonding strength of the coating.
The technical indexes of the high-speed electric arc spraying coating of the powder core wire material of the embodiment of the invention are as follows:
color appearance: dark gray;
tensile bond strength >30 MPa;
the porosity is less than 5 percent;
coating thickness: 200 to 500 μm.
According to the embodiment of the invention, the alloy elements with larger melting point difference are mixed for use, the formed coating has the characteristics of 'soft matrix + hard particles', and the formed Al-SiC-WC-Ti coating has the double characteristics of high pressure corrosion resistance and erosion resistance and has good impact resistance.
On the other hand, based on the same inventive concept, the embodiment of the invention provides an oil field storage and transportation facility, which comprises a substrate and a coating sprayed on the surface of the substrate, wherein the coating is prepared by using the cored wire through a high-speed electric arc spraying method.
The oilfield storage and transportation facilities include, but are not limited to, oilfield sewage storage tanks, three-phase separators, and the like, which are used in "high pressure corrosion + erosion" environments.
In order to enable those skilled in the art to further understand the scheme of the embodiment of the present invention, the following detailed description will be given based on the scheme described in the embodiment of the present invention.
Example 1
Taking SiC powder, WC powder and Ti powder, sieving the powder by a 60-mesh sieve, uniformly mixing the powder and the WC powder in proportion, and preparing a finished wire by taking a 1-series Al alloy strip with the specification of 10mm multiplied by 0.4mm (width multiplied by thickness) as a strip material, wherein the powder core filling rate of the wire is 37 percent, and the diameter of the wire is 2 mm. The crust adopts the 1 series aluminum alloy crust with the thickness of 0.4mm, which can ensure that the crust can still keep enough strength and toughness after being stretched, so that the wire feeding is smoother during spraying.
The Al alloy strip has the following alloy composition:
the alloy powder comprises the following components:
the spraying substrate is 45 steel, compressed air must be cleaned and dried during sand blasting pretreatment, the pressure is controlled to be 0.8MPa, corundum sand is adopted, the sand blasting angle is 80 degrees, the sand blasting distance is 160mm, the sand blasting requires that the substrate is completely exposed out of a fresh surface, the surface roughness of the substrate after sand blasting reaches Sa2.5 grade, and meanwhile, wire spraying is required to be completed within four hours after the surface treatment is completed;
the Al-SiC-WC-Ti coating is sprayed on the surface of a 45 steel matrix by adopting conventional electric arc spraying equipment, and the process parameters are as follows: the compressed air pressure is 0.8MPa, the spraying voltage is 34V, the spraying current is 120A, the spraying distance is 160mm, and the coating thickness is 350 mu m.
Example 2
Taking SiC powder, WC powder and Ti powder, sieving the powder by a sieve of 80 meshes, uniformly mixing the powder and the WC powder in proportion, and preparing a finished wire by taking a 1-series Al alloy belt with the specification of 10mm multiplied by 0.4mm (width multiplied by thickness) as a belt material, wherein the powder core filling rate of the wire is 35 percent, and the diameter of the wire is 2 mm.
The alloy powder comprises the following components:
the spraying substrate is Q235 steel, compressed air must be cleaned and dried during sand blasting pretreatment, the pressure is controlled to be 0.6MPa, corundum sand is adopted, the sand blasting angle is 70 degrees, the sand blasting distance is 150mm, the sand blasting requires that the substrate is completely exposed out of a fresh surface, the surface roughness of the substrate after sand blasting reaches Sa2.5 grade, and meanwhile, wire spraying is required to be completed within four hours after the surface treatment is completed;
a conventional electric arc spraying device is adopted to spray an Al-SiC-WC-Ti coating on the surface of a Q235 steel matrix, and the process parameters are as follows: the compressed air pressure is 0.6MPa, the spraying voltage is 36V, the spraying current is 140A, the spraying distance is 150mm, and the coating thickness is 300 mu m.
Example 3
Taking SiC powder, WC powder and Ti powder, sieving the powder by a sieve of 70 meshes, uniformly mixing the powder and the WC powder in proportion, and preparing a finished wire by taking a 1-series Al alloy strip with the specification of 10mm multiplied by 0.4mm (width multiplied by thickness) as a strip material, wherein the powder core filling rate of the wire is 33 percent, and the diameter of the wire is 2 mm.
The alloy powder comprises the following components:
the spraying substrate is A3 steel, when the sand blasting pretreatment is carried out, compressed air must be cleaned and dried, the pressure is controlled to be 0.7MPa, corundum sand is adopted, the sand blasting angle is 90 degrees, the sand blasting distance is 170mm, the sand blasting requires that the matrix is completely exposed out of a fresh surface, the surface roughness of the matrix after the sand blasting reaches Sa2.5 grade, and meanwhile, the wire spraying is required to be completed within four hours after the surface treatment is completed;
the Al-SiC-WC-Ti coating is sprayed on the surface of an A3 steel matrix by adopting conventional electric arc spraying equipment, and the process parameters are as follows: the compressed air pressure is 0.7MPa, the spraying voltage is 32V, the spraying current is 110A, the spraying distance is 170mm, and the coating thickness is 200 mu m.
Example 4
Taking SiC powder, WC powder and Ti powder, sieving the powder by a 50-mesh sieve, uniformly mixing the powder and the WC powder in proportion, and preparing a finished wire by taking a 1-series Al alloy belt with the specification of 10mm multiplied by 0.4mm (width multiplied by thickness) as a belt material, wherein the powder core filling rate of the wire is 33 percent, and the diameter of the wire is 2 mm.
The alloy powder comprises the following components:
the spraying substrate is Q235 steel, compressed air must be cleaned and dried during sand blasting pretreatment, the pressure is controlled to be 0.8MPa, corundum sand is adopted, the sand blasting angle is 80 degrees, the sand blasting distance is 180mm, the sand blasting requires that the substrate is completely exposed out of a fresh surface, the surface roughness of the substrate after sand blasting reaches Sa2.5 grade, and meanwhile, wire spraying is required to be completed within four hours after the surface treatment is completed;
a conventional electric arc spraying device is adopted to spray an Al-SiC-WC-Ti coating on the surface of a Q235 steel matrix, and the process parameters are as follows: the compressed air pressure is 0.8MPa, the spraying voltage is 34V, the spraying current is 120A, the spraying distance is 180mm, and the coating thickness is 500 mu m.
Example 5
Taking SiC powder, WC powder and Ti powder, sieving the powder by a sieve of 80 meshes, uniformly mixing the powder and the WC powder in proportion, and preparing a finished wire by taking a 1-series Al alloy belt with the specification of 10mm multiplied by 0.4mm (width multiplied by thickness) as a belt material, wherein the powder core filling rate of the wire is 35 percent, and the diameter of the wire is 2 mm.
The alloy powder comprises the following components:
the spraying substrate is Q235 steel, compressed air must be cleaned and dried during sand blasting pretreatment, the pressure is controlled to be 0.6MPa, corundum sand is adopted, the sand blasting angle is 70 degrees, the sand blasting distance is 160mm, the sand blasting requires that the substrate is completely exposed out of a fresh surface, the surface roughness of the substrate after sand blasting reaches Sa2.5 grade, and meanwhile, wire spraying is required to be completed within four hours after the surface treatment is completed;
a conventional electric arc spraying device is adopted to spray an Al-SiC-WC-Ti coating on the surface of a Q235 steel matrix, and the process parameters are as follows: the compressed air pressure is 0.6MPa, the spraying voltage is 32V, the spraying current is 120A, the spraying distance is 160mm, and the coating thickness is 400 mu m.
Example 6
Taking SiC powder, WC powder and Ti powder, sieving the powder by a 60-mesh sieve, uniformly mixing the powder and the WC powder in proportion, and preparing a finished wire by taking a 1-series Al alloy strip with the specification of 10mm multiplied by 0.4mm (width multiplied by thickness) as a strip material, wherein the powder core filling rate of the wire is 36 percent, and the diameter of the wire is 2 mm.
The alloy powder comprises the following components:
the spraying substrate is Q235 steel, compressed air must be cleaned and dried during sand blasting pretreatment, the pressure is controlled to be 0.8MPa, corundum sand is adopted, the sand blasting angle is 90 degrees, the sand blasting distance is 180mm, the sand blasting requires that the substrate is completely exposed out of a fresh surface, the surface roughness of the substrate after sand blasting reaches Sa2.5 grade, and meanwhile, wire spraying is required to be completed within four hours after the surface treatment is completed;
a conventional electric arc spraying device is adopted to spray an Al-SiC-WC-Ti coating on the surface of a Q235 steel matrix, and the process parameters are as follows: the compressed air pressure is 0.8MPa, the spraying voltage is 36V, the spraying current is 130A, the spraying distance is 180mm, and the coating thickness is 450 mu m.
The Al-SiC-WC-Ti coating obtained by spraying in the embodiment of the invention is subjected to high-pressure erosion comparative analysis with a pure Al coating. The test coating surface area was 100mm x 50 mm. Firstly, soaking a coating to be tested in 3.5% NaCl solution for 72h under high pressure (5MPa), and then carrying out weight loss test on the coating on an erosion testing machine so as to investigate the high-pressure erosion resistance of the coating. In an erosion test, a liquid medium is 3.5 percent NaCl solution, the sand content is 2 to 3 percent, the erosion angle is 90 degrees, the erosion speed is 10m/s, and the erosion time is 24 hours. The corrosion rate profile of the coating is shown in table 1:
TABLE 1 test results of high pressure erosion resistance of coating
| Coating layer | Average weight loss/mg | Corrosion rate/(g/m)2·h) |
| Example 1 | 143.3 | 1.19 |
| Example 2 | 136.6 | 1.14 |
| Example 3 | 148.8 | 1.24 |
| Example 4 | 157.2 | 1.31 |
| Example 5 | 153.8 | 1.28 |
| Example 6 | 166.7 | 1.39 |
| Pure Al coating | 658.3 | 5.49 |
As shown in Table 1, compared with a pure Al coating, the high-speed electric arc spraying coating prepared by the cored wire provided by the embodiment of the invention has the advantages that the corrosion rate is greatly reduced in a high-pressure corrosion and erosion environment, and the service life of steel structure facilities for storage and transportation in oil fields can be prolonged.
FIG. 2 shows the macroscopic morphology of the Al-SiC-WC-Ti coating, and the surface of the Al-SiC-WC-Ti coating is very dense from the macroscopic morphology. FIG. 3 shows the microstructure of the Al-SiC-WC-Ti coating, from which the molten drop overlap is good and no obvious pores appear, indicating that the Al-SiC-WC-Ti coating has a good appearance under the given composition and process conditions.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. A powder core wire material, composed of an aluminum alloy sheath and a powder core formed by alloy powder, characterized in that the alloy powder contains SiC, WC and Ti; according to the mass ratio, the alloy powder comprises the following components in percentage by mass: SiC: 8% -46%, WC: 14% -46%, Ti: 8% -46%, the granularity of the SiC, the WC and the Ti is 178-;
the diameter of the powder core wire is 2 mm.
2. A method of producing a high speed arc spray coating using the cored wire of claim 1, comprising:
carrying out sand blasting pretreatment on the surface of the matrix;
and spraying the powder core wire material on the surface of the pretreated substrate to form an Al-SiC-WC-Ti high-speed electric arc spraying layer.
3. The method of claim 2, wherein the substrate material is carbon steel or alloy steel.
4. The method as claimed in claim 2, wherein the blasting pretreatment is carried out while controlling the pressure to be 0.6-0.8MPa, the blasting angle to be 70-90 °, and the blasting distance to be 150-180 mm.
5. The method of claim 2, wherein the process parameters of the high speed arc spraying are: the compressed air pressure is 0.6-0.8MPa, the spraying voltage is 32-36V, the spraying current is 110-.
6. The method of claim 2, wherein the Al-SiC-WC-Ti high-velocity arc sprayed layer has a thickness of 200-500 μm.
7. An oil field storage and transportation facility comprising a substrate and a coating sprayed on the surface of the substrate, wherein the coating is produced by high speed arc spraying of the cored wire of claim 1.
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| CN107604194B (en) * | 2017-10-31 | 2022-07-15 | 湖北汽车工业学院 | Wire and powder feeding coupling device based on arc deposition metal matrix composite |
| CN108149182A (en) * | 2017-12-20 | 2018-06-12 | 商丘工学院 | The method that powder core aluminium wire material electric arc spraying prepares silicon carbide aluminum matrix composite |
| CN110791725B (en) * | 2019-10-11 | 2022-07-26 | 中国人民解放军陆军装甲兵学院 | Powder core wire material suitable for plasma spraying and coating preparation method |
| CN113802080B (en) * | 2021-09-23 | 2023-03-17 | 无锡市通瑞电力自动化设备有限公司 | Aluminum silicon carbide heat conduction material for high-power charging pile and preparation method thereof |
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| CN101597736A (en) * | 2009-07-03 | 2009-12-09 | 北京工业大学 | A kind of high hardness erosion resistance cored wire that adds norbide |
| CN102644045B (en) * | 2012-04-28 | 2014-10-22 | 中国人民解放军装甲兵工程学院 | Cored wire of high-speed electric arc spraying nickel-base amorphous nanocrystalline antifriction coating |
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